Dry concentrator.



S..K'. BEHREND.

.DRY GONGENTRATOR.

APPLIOA'I'ION FILED DEO.18, 1906.

THE mmms PETERS 6a., wasumarolg, L. c.

Patented Feb. 7; 1911.

- 2 SHEETS-SHEET 1.

S. K. BEHREND.

DRY GONCENTRATOR. APPLICATION FILED 11110.18, 190s.

Patnted Feb. 7, 1911.

Z SHEETS-SHEET 2.

\\\\\\\\\\&\\\\\\\\\\\\\\\\\\\\ Smuemtoz Witnesses rm: mmms PETERS c0.WASHINGTON, D. c.

SAMUEL K. BEHREND, OF DENVER, COLORADO,

DRY CONCENTBATOR.

Specification of Letters Patent.

Patented Feb. '7, 1911.

Application filed December 18, 1906. Serial No. 348,469.

To all whom it may concern:

Be it known that I, SAMUEL K. BEHREND, a citizen of the United States,residing at Denver, in the county of Denver and State of Colorado, haveinvented certain new and useful Improvements in Dry Concentrators, ofwhich the following is a specification.

My invention relates to an improvement in dry concentrators, for oreseparation, and the object of this invention is to provide means foreffecting a more perfect and more economical separation of the valuesthan has heretofore been obtained, and further to provide mechanismwhich will save values which hitherto have been lost.

Vith the foregoing objects in view, my invention consists in certainnovel features of construction and combinations of parts which will behereinafter described and pointed out in the claims.

In the accompanying drawings :'Figure 1 is a View in end elevation of myimproved concentrator. Fig. 2 is a vertical, sectional view. Fig. 3 is aplan view. Fig. 4 is a fragmentary transverse section on an enlargedscale. Fig. 5 is a detail view of one form of rifiie. Fig. 6 is anenlarged transverse section of one of these riflles. F 7 is afragmentary longitudinally sectional view of one of the riifles. Figs. 8and 9 are views of modified forms of riifles, the former beingfragmentary and in trans verse section, and the latter in sideelevation.

The numeral 5 designates the outer casing, which is provided withtransversely inclined partitions 6, 6, whereby two chambers are formed,the upper of which is for the values, and the lower constituting asuction chamber, it having a fan 9 therein, which fan is mounted on afan shaft 11, the function of the fan being to create suction, and theair thus drawn into the fan is discharged through chute 10. Valves 8, 8,are provided in the suction chamber and discharge chamber for regulatingthe amount of suction and discharge at this point to a nicety, but allbeing within the control of the operator. Various forms of valves 8,might be employed, but those shown are slide valves.

The numeral 12 indicates the main shaft, it having a step pulley 13,whereby different amounts of speed may be imparted to it. This shaft isprovided with a large sheave 17 adapted to receive a cable shown indotted lines in Fig. 1, which extends to a smaller sheave 18, on the fanshaft 11. Shaft 11 is provided with an eccentric 22, from which aneccentric rod 23 extends to a crank 20 on the rock shaft 19. The shaft19 is provided with an arm 21 at or near its center, the upper end ofwhich is pivotally connected with the reciprocating table 24, which ispreferably slightly inclined. The riffie portion of the table ispreferably covered by means of plate glass 28 held in a frame 29, whileits rear portion is covered with a board 80. The frame 29 is capable ofadjustment by means of the cables 33, 33, which pass over pulley 34,34;, and a windlass 40, whereby the desired force of air current upwardalong the face of the table is regulated.

The numeral 31 illustrates the feed hopper and 82 represents a flexibleair tight connection of leather, canvas or the like between the lowerend of the table and the frame of the machine.

In general characteristics, the foregoing closely resembles the oldGranger machine set forth in Letters Patent No. 269,848, Jannary 2,1883, and No. 386,7t1, July 2 1, 1888,

although my present invention embodies certain features which theGranger patents did not disclose.

In addition to the construction heretofore described, the table 24: isprovided with a plurality of longitudinal slots 25, and in these aresecured my improved form of riffles 26, which may be variouslyconstructed, although in Figs. 4:, 5, 6, and 7, I have shown theseriflies being composed of sheet metal, bent substantially as shown andpreferably inclining forward, although they might incline in theopposite direction, by folding a strip of metal as illustrated andcutting through the fold to form orifices into and through which thevalues are sucked by the suction fan. In Fig. 8, a slightly differentform is shown in which the rifiies are made an integral part of thetable, and through them the holes 36, 36, are bored or slotted with asaw, as desired.

From the foregoing it will be observed that one of the essentialcharacteristics of my present invention resides in the fact that theopenings through the table are of a nonuniform height, and a very easygrade is provided for the lighter material to raise itself to the airexhaust with the result that it gives a more complete and perfectdressing to the ore.

In operation the material is fed into the hopper 31, and as the tablereciprocates the heavier particles are carried toward the bottom of thetable, and the suction operates to draw down through the air openingsthe lighter material or waste. The heavy material or concentrates, findsits way finally to the end of the table where it is discharged as aclean concentrate, into a hopper or spout (not shown) which leads off toits respective ore bin; the tailings also being led by a spout (notshown) out of the mill to the dump; the passage of the air for suctionfrom the exhauster to the table is not intended in any way to carry theore, but the waste, and all the valuable material will stay on the tableand be discharged at the lower end, and not go through the hollowrifles. This table is particularly adapted to the working of what isknown as a complex ore; such an ore as would carry lead, iron, zinc andsilica, and by working such a product on the table and using a speedsuflcient to draw off all material of a less specific gravity than lead,it would be drawn through and discharged as tailings, leaving the leadas a clean concentrate, then the tailings should then be run through asecond machine under a slower speed, which would remove again thelighter materials, and leaving the iron as a concentrate, and thetailings from this operation would then again be run to a third machineunder a slower speed, when the zinc would be removed as a cleanconcentrate and the tailings would be simply silica.

It is evident that slight changes might be resorted to in the form andarrangement of the several parts described without depart ing from thespirit and scope of my invention, and hence I do not wish to limitmyself to the exact construction herein set forth, but

Having fully described my invention, what I claim as new and desire tosecure by Letters Patent, is

1. In an ore concentrator, thecombination with a suitable frame, of aninclined re ciprocating table having a plurality of riffies thereonextending in the direction of the motion of the table, said rifleshaving an inclination with respect to the surface of the table, andprovided with holes through which the waste is adapted to pass.

2. A rifle for ore concentrators of tapering thickness and having auniform width throughout its length, and having orifices formed in itsupper surface.

3. A rifle for ore concentrators having a series of passages thereinextending throughout the length of the rifle, said passages at varyingelevations, in relation to the bottom of the rifle.

4. The combination with a concentrator table and a plate arranged at asuitable distance above the table whereby an air space is left betweenthe two, and means for creating suction through said space, of rifleslocated within said space and having passages formed therein atdifferent elevations.

5. The combination with a concentrator table and a plate arranged at asuit-able distance above the table whereby an air space is left betweenthe two, and means for creating suction through said space, of rifleslocated within said space and having orifices formed therein atdifferent elevations, said orifices all opening toward one end of therifle.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

SAMUEL K. BEHREND. lVitnesses:

ELLA J. Burns, Ina K. PENOE.

